Measures of Variability Answers

A sample of 50 students was surveyed about their time spent in front of a screen (laptop, tablet, phone, etc.). Each interval contains the left endpoint but not the right endpoint.

Twelve people were surveyed and asked how many people live in their residence. The results are summarized in the table below.

Thirty-six students at a large university were given a test to measure their intelligence quotient (IQ). A histogram of the IQ test scores is shown below. In each interval, the left endpoint is included in the interval, but not the right endpoint.

Twelve people were surveyed and asked how many people live in their residence. The results are summarized in the table below.

A simple random sample of 10 people was asked how many first cousins they have. The results are listed below.10, 19, 20, 13, 13, 2, 10, 8, 25, 10

A simple random sample of 14 students on a large university campus is asked to complete a survey. One of the questions on the survey asks for the number of credit hours for which they are currently enrolled. The results of the survey are shown below.12, 9, 13, 15, 12, 16, 19, 13, 12, 12, 16, 12, 14, 6

In some gymnastics meets, the score given to a gymnast is the mean of the judges’ scores after the highest and lowest scores have been tossed out. Nikita’s scores on the floor routine from all of the judges are shown below.7.50, 7.50, 7.75, 7.75, 8.00, 8.00, 8.00, 10.00

IQ scores are collected from a sample of 36 students at a large university. The scores are summarized in the histogram below.

The distribution of ages of runners in a marathon is approximately normal. The oldest participant was 80 and the youngest was 13. Which of the following statements is true of the mean and median ages of the runners?

IQ scores are collected from a sample of students at a large university. The scores are shown below.99, 100, 105, 104, 102, 105, 105, 121, 104